399858499 has 2 divisors, whose sum is σ = 399858500. Its totient is φ = 399858498.

The previous prime is 399858379. The next prime is 399858509. The reversal of 399858499 is 994858993.

It is a strong prime.

It is an emirp because it is prime and its reverse (994858993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399858499 - 2¹⁵ = 399825731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399858499.

It is not a weakly prime, because it can be changed into another prime (399858799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199929249 + 199929250.

It is an arithmetic number, because the mean of its divisors is an integer number (199929250).

Almost surely, 2^399858499 is an apocalyptic number.

399858499 is a deficient number, since it is larger than the sum of its proper divisors (1).

399858499 is an equidigital number, since it uses as much as digits as its factorization.

399858499 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25194240, while the sum is 64.

The square root of 399858499 is about 19996.4621620926. The cubic root of 399858499 is about 736.7194071243.

It can be divided in two parts, 39985 and 8499, that added together give a palindrome (48484).

The spelling of 399858499 in words is "three hundred ninety-nine million, eight hundred fifty-eight thousand, four hundred ninety-nine".